package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点表达式
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}


    /**
     * 前置通知
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段的填充...");
        //获取当前数据库操作类型：update或者insert
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();
        //获取实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object arg = args[0];
        //准备自动填充的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性赋值
        if(operationType == OperationType.INSERT){
            try {
                //通过反射获取方法名
                Method setCreateTime = arg.getClass().getMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = arg.getClass().getMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateTime = arg.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //通过获取到的方法名为属性赋值
                setCreateTime.invoke(arg,now);
                setCreateUser.invoke(arg,currentId);
                setUpdateTime.invoke(arg,now);
                setUpdateUser.invoke(arg,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if(operationType == OperationType.UPDATE){
            try {
                //通过反射获取方法名
                Method setUpdateTime = arg.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //通过获取到的方法名为属性赋值
                setUpdateTime.invoke(arg,now);
                setUpdateUser.invoke(arg,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }
}
